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04 Nissan Altima 2.5 p0300 code

  • tchaudhry10
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08 May 2019 17:38 #29414 by tchaudhry10
04 Nissan Altima 2.5 p0300 code was created by tchaudhry10
04 altima with 204k miles.

Random misfire code p0300. This is the only code that is showing up. B1S1 is showing lean while B1S2 is reading rich. Both will respond to snap throttle. If I unplug ignition coil one at a time, there is a significant amount of RPM drop on cylinders 1,2, and 3. #4 there is no change in RPM. There is spark on #4 however and swapped coils, same thing. Fuel trims are normal.

Can you give me some advice?

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08 May 2019 20:40 #29424 by Monde
Replied by Monde on topic 04 Nissan Altima 2.5 p0300 code
If you have spark in cylinder 4 and does not have a significant drop in RPM with the cylinder drop test, you can check to see if you have injection pulse and/or do an injector balance test, also you can do a compression test to determine the cause of the misfire.

Vouloir, c'est pouvoir.

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08 May 2019 20:50 #29426 by robert.lesaca
Replied by robert.lesaca on topic 04 Nissan Altima 2.5 p0300 code
agree...use noid light or test light to check for injector pulsing. perhaps spark arching from the plug wires?

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08 May 2019 20:51 #29428 by robert.lesaca
Replied by robert.lesaca on topic 04 Nissan Altima 2.5 p0300 code
or compression problem in cyl 4...

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08 May 2019 20:55 #29429 by Monde
Replied by Monde on topic 04 Nissan Altima 2.5 p0300 code
You stated that you have spark. Do you have a weak spark? Did you check the spark plug condition, mainly its gap?

Vouloir, c'est pouvoir.

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08 May 2019 22:19 #29434 by tchaudhry10
Replied by tchaudhry10 on topic 04 Nissan Altima 2.5 p0300 code
The spark seemed pretty consistent across all cylinders. Will do a noid light test tomorrow and follow up with updates. thanks!

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